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Interpretations Browser

49 CFR Parts 300-399

This section of the website provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. Below is a list of parts, identified by the part number and subject. To browse sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

FMCSA interpretations for regulations is available on this website using the interpretations browser to the left. Click the glass icon to search by keyword or the the filter icon to view a list of section categories and a specific item to view sections that have interpretations available. The "" icons will collapse and expand the interpretations browser.

The eCFR is also searchable by keyword and other available options on the eCFR website. To search and browse regulations using the eCFR website, use the link below. For assistance, please send an email to FMCSA.Webmaster@dot.gov. Search the eCFR